New York, May 27 : Bristol Palin has said that her pregnancy in the spotlight of the 2008 presidential campaign was "humiliating", and that the father of her baby-Levi Johnston-is "a stranger".

In a new interview with Harper's Bazaar, Bristol talked of her feelings when the McCain-Palin campaign revealed the high school student was pregnant.

"Great, I'm 17 years old, I'm 40 pounds overweight with a big belly on me, all my friends are at school watching this on the news. This kind of sucks," the New York Post quoted Palin, now 19, as saying of her experience during the campaign.

Palin, an ambassador for the Candie's Foundation, a non-profit foundation that aims to fight teenage pregnancy, also said that she didn't agree with critics who consider her work for the organization hypocritical.

"Like, if you get lung cancer from smoking, why wouldn't you want to tell people, 'Hey, look, don't smoke.' Why wouldn't you want to be productive and share your story and do something positive with it?" she said.

When asked about her response to Johnston's decision to pose for Playgirl, Palin declined to mock her ex.